Solid block detergent



FIG. 1 is a perspective view of the top and side of our new design;

FIG. 2 is a top plan view, which is identical to the bottom plan view, of our new design;

FIG. 3 is a front elevation view, which is identical to a rear view, of our new design; and,

FIG. 4 is a left side elevation view, which is identical to a right side elevation view, of our new design. 

The ornamental design for a solid block detergent, as shown and described. 